added headscale to vpn server

modules/headscale.nix

@@ -0,0 +1,66 @@
+{ pkgs, lib, ... }:
+let
+  headscalePort = "6969";
+  headscaleDomain = "vpn.mc-fucker.cool";
+in
+{
+  environment = {
+    systemPackages = with pkgs; [ headscale wireguard ];
+    etc = {
+      "headscale/config.yaml".text = ''
+        ---
+        disable_check_updates: true
+        server_url: http://${headscaleDomain}:${headscalePort}
+        listen_addr: 0.0.0.0:${headscalePort}
+        ephemeral_node_inactivity_timeout: "30m"
+        private_key_path: /etc/nixos/keys/headscale-key
+        db_type: sqlite3
+        db_path: db.sqlite
+        derp:
+          urls:
+            - https://controlplane.tailscale.com/derpmap/default
+          paths:
+            - /etc/headscale/derp-example.yaml
+          auto_update_enabled: true
+          update_frequency: 24h
+        dns_config:
+          magic_dns: true
+          base_domain: ${headscaleDomain}
+          nameservers:
+            - 9.9.9.9
+      '';
+      "headscale/derp-example.yaml".text = ''
+        regions:
+          900:
+            regionid: 900
+            regioncode: custom
+            regionname: My Region
+            nodes:
+            - name: 1a
+              regionid: 1
+              hostname: myderp.mydomain.no
+              ipv4: 123.123.123.123
+              ipv6: "2604:a880:400:d1::828:b001"
+              stunport: 0
+              stunonly: false
+              derptestport: 0
+      '';
+    };
+  };
+
+  systemd.services.headscale = {
+    description = "Headscale VPN Server";
+    wantedBy = [ "multi-user.target" ];
+    after = [ "network-online.target" ];
+    serviceConfig = {
+      ExecStart = "${pkgs.headscale}/bin/headscale serve";
+      ExecReload = "/bin/kill -HUP $MAINPID";
+      Restart = "on-failure";
+      Type = "simple";
+    };
+  };
+
+  networking.firewall.allowedTCPPorts = [ (lib.strings.toInt headscalePort) ];
+}
+
+# vim: set et ts=2 sw=2 ai:

systems/vpn/configuration.nix

@@ -4,6 +4,7 @@
     [
       ./hardware-configuration.nix
       ./modules/generic.nix
+      ./modules/headscale.nix
     ];
   system.stateVersion = "21.11";
 }